def word_frequency ( words ):

#
#  Create an empty dictionary named 'counts' to store word frequencies.
#
  counts = dict()
#
#  Consider each word in the list.
#
  for word in words:

    if word in counts:
      counts[word] = counts[word] + 1
    else:
      counts[word] = 1

  return counts

def word_frequency_test ( ):

  words = [ 
    'A', 'sailor', 'went', 'to', 'sea', 'sea', 'sea', 
    'To', 'see', 'what', 'he', 'could', 'see', 'see', 'see',
    'But', 'all', 'that', 'he', 'could', 'see', 'see', 'see',
    'Was', 'the', 'bottom', 'of', 'the', 'deep', 'blue', 'sea', 'sea', 'sea' ]

  print ( '' )
  print ( '  Word list:' )
  print ( '' )
  print ( words )

  counts = word_frequency ( words )
  print ( '' )
  print ( '  Word frequency dictionary:' )
  print ( '' )
  print ( counts )
  return

if ( __name__ == "__main__" ):
  word_frequency_test ( )